Comment 2 for bug 1975388

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Julian Andres Klode (juliank) wrote : Re: upgrade from 18.04 to 20.04 while on rollbacked kernel 4.15-0-177 - package grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

Thank your for your bug report. This seems to be the result of local misconfiguration, installing an unsigned kernel, and the script does exactly what it was supposed to do.

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